CMC Medical CMC-Medical Ludhiana Solved Paper-2010

  • question_answer
    A proton and an \[\alpha \]-particle enter a uniform magnetic field with the same velocity. The time period of rotation of \[\alpha \]- particle will be

    A)  two times as that of proton

    B)  half as that of proton

    C)  four times as that of proton

    D)  same as that of proton

    Correct Answer: A

    Solution :

                    Time period, \[T=\frac{2\pi m}{Bq}\] \[\Rightarrow \]               \[T\propto \frac{m}{q}\] \[\therefore \]  \[\frac{{{T}_{\alpha }}}{{{T}_{P}}}=\left( \frac{m\alpha }{{{m}_{p}}} \right)\left( \frac{{{q}_{p}}}{{{q}_{\alpha }}} \right)\] \[=\left( \frac{4{{m}_{p}}}{{{m}_{p}}} \right)\left( \frac{{{q}_{p}}}{2{{q}_{p}}} \right)\] \[={{T}_{\alpha }}=2{{T}_{p}}\]


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